Recent changes in Imja Glacial Lake and its damming moraine in the Nepal Himalaya revealed by in situ surveys and multi-temporal ASTER imagery
Recent changes in Imja Glacial Lake and its damming moraine in the Nepal Himalaya revealed by in situ surveys and multi-temporal ASTER imagery
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DOI：
10.1088/1748-9326/4/4/045205
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发表时间：
2009-10-01
影响因子：
6.7
通讯作者：
Sharma, Rishi R.
中科院分区：
文献类型：
--
作者：
Fujita, Koji;Sakai, Akiko;Sharma, Rishi R.
对尼泊尔喜马拉雅地区昆布地区Imja冰川湖的面积和水深变化及其筑坝冰碛的高程变化进行了研究。以前报告的湖泊面积的变化已经更新了多时ASTER图像，显示2000年后的扩张率下降。在2004年观察到的湖泊临时扩张，一些研究得出结论，由于全球变暖，湖泊加速扩张，从2005年开始，已经消退到冰川表面。1992年至2002年期间的水深变化，首次获得喜马拉雅冰川湖泊表明，在湖泊体积的增加方面，湖底的碎屑覆盖的冰的融化是微不足道的，并通过崩解与湖泊接触的冰川退缩是必不可少的湖泊的扩张。2001-2007年期间的筑坝冰碛高度的变化表明，湖附近的表面持续下降，但下降率小于1989-1994年期间。
Changes in the area and bathymetry of Imja Glacial Lake and in the elevation of its damming moraine, Khumbu region, Nepal Himalaya are investigated. Previously reported changes in the lake area have been updated by multi-temporal ASTER images, which revealed a decreased expansion rate after 2000. A provisional expansion of the lake observed in 2004, from which some studies concluded an accelerated lake expansion due to global warming, has, from 2005, subsided to the glacier surface. Bathymetric changes for the period 1992-2002 that were first obtained for Himalayan glacial lakes suggest that the melting of debris-covered ice beneath the lake is insignificant in terms of the increase in lake volume, and that the retreat of a glacier in contact with the lake by calving is essential for the lake's expansion. Changes in the height of a damming moraine for the period 2001-2007 suggest a continuous surface lowering near the lake, though the lowering rates are smaller than those for the period 1989-1994.